Method for preparing metal-polymer resin composite

Abstract

The present disclosure relates to a method for preparing a metal-polymer resin composite with excellent bonding strength and bonding uniformity. The method includes a pretreatment step (S1) of etching a metal member, an electrolysis process step (S2) of forming an adhesive coating layer on a surface of the pretreated metal member, a drying step (S3) of drying the metal member with the adhesive coating layer formed on the surface, and an injection-molding process step (S4) of bonding a polymer resin to the dried metal member, and the electrolysis process is performed in an electrolyte solution containing a sulfur-containing compound and a metal chelate compound.

What is claimed is: 
     
         1 . A method for preparing a metal-polymer resin composite, the method comprising:
 a pretreatment step (S1) of etching a metal member, which is one or more selected from a group consisting of copper, a copper clad, and a copper alloy;   an electrolysis process step (S2) of forming an adhesive coating layer on a surface of the pretreated metal member;   a drying step (S3) of drying the metal member with the adhesive coating layer formed on the surface; and   an injection-molding process step (S4) of bonding a polymer resin to the dried metal member,   wherein the electrolysis process is performed in an electrolyte solution containing a sulfur-containing compound and a metal chelate compound, and   wherein the injection-molding process step (S4) is performed by preheating the metal member to an injection-molding temperature and then directly injection-molding the polymer resin onto the preheated metal member.   
     
     
         2 . The method of  claim 1 , wherein the electrolyte solution is prepared by adding and mixing the sulfur-containing compound and the metal chelate compound to and with distilled water. 
     
     
         3 . The method of  claim 1 , wherein the electrolyte solution is prepared by mixing 5 g to 500 g of the sulfur-containing compound and 1 g to 100 g of the metal chelate compound for each 1L of distilled water. 
     
     
         4 . The method of  claim 1 , wherein the sulfur-containing compound is one or more selected from sulfuric acid, ammonium sulfate, and sodium sulfate. 
     
     
         5 . The method of  claim 1 , wherein the metal chelate compound is one or more selected from a group consisting of copper ethylenediaminetetraacetate (EDTA-Cu), disodium copper ethylenediaminetetraacetate (EDTA-2NaCu), and diammonium copper ethylenediaminetetraacetate (EDTA-Cu (NH 4 ) 2 ). 
     
     
         6 . The method of  claim 1 , wherein the electrolyte solution further contains one or more copper organic compounds selected from a group consisting of cupric chloride, copper (II) trifluoroacetate hydrate, cupric hydroxide, cupric carbonate, and copper oxide. 
     
     
         7 . The method of  claim 1 , wherein the electrolysis process (S2) is performed by immersing the metal member in the electrolyte solution and performing electrolysis at a temperature in a range from 15° C. to 80° C. for 60 seconds to 3600 seconds at a constant voltage in a range from 0.1V to 50V. 
     
     
         8 . The method of  claim 1 , wherein the pretreatment step (S1) is performed by sequentially performing a degreasing process step (S1-1), an etching process step (S1-2), and a desmut step (S1-3). 
     
     
         9 . The method of  claim 8 , wherein the etching process step (S1-2) is performed by immersing the metal member in an etching solution at a temperature in a range from 15° C. to 80° C. for 30 seconds to 300 seconds. 
     
     
         10 . The method of  claim 9 , wherein the etching solution is a mixed solution of 5 g to 500 g of strong acid and 5 g to 200 g of hydrogen peroxide for each 1 L of distilled water. 
     
     
         11 . The method of  claim 8 , wherein the desmut step (S1-3) is performed via immersing the metal member in an alkaline aqueous solution; or via immersing the metal member in the alkaline aqueous solution and performing an ultrasonic treatment,
 wherein the immersing is performed at a temperature in a range from 15° C. to 80° C. for 30 seconds to 300 seconds.   
     
     
         12 . The method of  claim 11 , wherein the alkaline aqueous solution is a mixed solution of 5 g to 200 g of at least one selected from alkali metal hydroxide and alkaline earth metal hydroxide for each 1 L of distilled water. 
     
     
         13 . The method of  claim 1 , wherein the metal member is washed with hot water before the drying in the drying step (S3). 
     
     
         14 . The method of  claim 13 , wherein the hot water washing is performed using distilled water at a temperature in a range from 15° C. to 100° C. 
     
     
         15 . The method of  claim 1 , wherein the polymer resin is one or more selected from a group consisting of polybutylene terephthalate, polyphenylene sulfide, polyphthalamide, polyethylene terephthalate, polycarbonate, polypropylene, polyimide, polyethylene, liquid crystal polymer, polyether ether ketone, polyaryl ether ketone, polyamide, polyamide6, and polyamide66.